20kW on board charger
20kW On-Board Charger (Liquid-Cooled) | IP67 Waterproof | 500V–850V High-Voltage EV Power Solution
As the industry pivots toward high-voltage battery architectures, managing thermal loads during high-power charging is paramount. Our 20kW On-Board Charger (OBC) is a heavy-duty, liquid-cooled power conversion unit engineered for electric buses, commercial trucks, and premium passenger EVs. It delivers a massive 20kW output while maintaining a compact, automotive-grade form factor.
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High Power Density: Delivers a continuous 20kW output for rapid AC charging.
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Liquid-Cooled Thermal Management: Optimized for flow rates ≥ 10 L/min, ensuring stable performance under extreme loads.
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800V Architecture Ready: Supports a wide output range of 500V–850VDC for modern high-voltage platforms.
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Automotive-Grade Protection: Fully sealed IP67 enclosure for superior resistance to water, dust, and vibration.
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Smart Diagnostics: Features full digital software with redundant protection and support for online upgrades.
Technical Expertise & Safety Integrity
1. Advanced Liquid-Cooling Efficiency
Thermal management is the cornerstone of reliability in high-power electronics. Our 20kW OBC utilizes a precision-engineered liquid-cooling baseplate. By integrating into the vehicle’s primary coolant loop, the unit prevents thermal derating even in high-ambient environments (operating up to 85°C). This allows for sustained ≥94% efficiency, reducing energy waste and protecting internal power modules.
2. Precision Power Control
Reliability in power electronics requires strict accuracy. This unit delivers ± 1% voltage accuracy and ± 3% current accuracy, ensuring a safe and stable charging curve that preserves the chemical life of your battery pack. The wide input range of 85V–265VAC ensures global grid compatibility.
3. Redundant Protection Suite
To ensure maximum Trustworthiness, the charger is designed with a comprehensive safety architecture:
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Input/Output Protection: Under-voltage and over-voltage safeguards.
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Thermal Protection: Real-time monitoring and over-temperature shutdown.
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Circuit Protection: Instantaneous output short-circuit and over-current protection.
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Battery Protection: Reverse-connection protection and communication fault safeguarding via CAN-BUS.
Technical Specifications
| Category | Parameter | Specification |
| Electrical | Rated Power | 20kW |
| Input Voltage Range | 85V–265VAC | |
| Output Voltage Range | 500V–850VDC | |
| Max Output Current | 32A | |
| Peak Efficiency | ≥ 94% | |
| Environmental | Operating Temp | -40°C to +85°C (Inlet Coolant Temp) |
| Cooling Method | Liquid-Cooled (≥10L/min) | |
| Protection Level | IP67 | |
| Control | Communication | CAN-BUS |
| Static Current | ≤ 1mA(Sleep/Shutdown) |
Frequently Asked Questions (FAQ)
Q: Why is liquid cooling necessary for a 20kW OBC?
A: At 20kW, the heat density is too high for traditional air cooling in a compact space. Liquid cooling allows the unit to maintain full power output without “throttling,” ensuring the fastest possible AC charging regardless of external weather conditions.
Q: Is this charger compatible with 400V battery systems?
A: This specific model is optimized for high-voltage 500V–850V architectures (800V platforms). If your vehicle uses a 400V system, please contact our engineering team for the 400V-compatible configuration.
Q: Can the firmware be updated after installation?
A: Yes. The charger supports online upgrades via the CAN-BUS interface. This allows fleet managers to update charging protocols or diagnostic logic without hardware removal.
Q: How does the unit handle auxiliary battery drain?
A: The unit features an ultra-low quiescent (static) current of ≤ 1 mA. Even when the vehicle is parked for long periods, the OBC will not significantly drain the 12V auxiliary battery.
